Four winged dinosaur?

>From an AP story:
Fossil hunters in China have discovered what may be one of the
weirdest prehistoric species ever seen -- a four-winged dinosaur
that apparently glided from tree to tree.
refers to Microraptor gui
http://www.nytimes.com/aponline/science/AP-Four-Winged-Dinosaur.html
and
Paleontologists were intrigued by the discovery. They have seen
gliding dinosaurs before, but never one with feathers. And they
have never seen a four-winged dinosaur before.
They have seen gliding dinosaurs before? And why should the
hind leg be considered as a wing associated with gliding?
Have I missed something here?
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